EXHIBIT 32.1

                            CERTIFICATION PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
                            (18 U.S.C. SECTION 1350)

I, Robert Glaser, Chairman and Chief Executive Officer of RealNetworks, Inc.,
certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of RealNetworks,
Inc. on Form 10-Q for the fiscal quarter ended June 30, 2003 fully complies with
the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of
1934 and that information contained in such Quarterly Report on Form 10-Q fairly
presents in all material respects the financial condition and results of
operations of RealNetworks, Inc.

Date: August 13, 2003

                                  By: /s/ Robert Glaser
                                      ------------------------------------------
                                  Name: Robert Glaser
                                  Title: Chairman and Chief Executive Officer

A signed original of this written statement required by Section 906 has been
provided to RealNetworks, Inc. and will be retained by RealNetworks, Inc. and
furnished to the Securities and Exchange Commission or its staff upon request.

                                      -55-